With the amount of threads tied up (rather quickly) in this one, I wouldn't be 100% certain of getting another Voyager from Kirsten...
I disagree, i think while a lot of things were tied up .. more things were left ..... While the ships were destroyed, the crews that were trapped are most likely still alive, How or why is kes still alive, will more ships be sent from the delta quadrant? Will Janeway be allowed the position as fleet commander.
Unless she doesnt want to do another one i really think it would be a mistake to ask someone else to take over.